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下面列出的条目中，哪些是数据仓库的基本特征（ ）。 Ⅰ．数据仓库是面向主题的Ⅱ．数据仓库的数据是集成的 Ⅲ．数据仓库的数据是绝对稳定的Ⅳ．数据仓库的数据是反映历史变化的 A）Ⅰ、Ⅱ和Ⅲ B）Ⅰ、Ⅱ和Ⅳ C）Ⅱ、Ⅲ和Ⅳ D）都是
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